If you’ve been having difficulty starting the Duratec 35 3.5L V6 engine in your 1st generation (2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 and 2019) Ford Flex on a cold morning and the OEM 12 volt car battery is a few years old, you probably need to replace it. Check out my DIY tutorial for the procedure (with the OEM group size and the compatible replacement part numbers) by clicking on the text link or thumbnail image below.
2009-2019 Ford Flex 12V Automotive Battery Replacement Guide
